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Add closed param to kerf() 

Allow for non close line segments and handle ends correctly
This commit is contained in:
Florian Festi 2016-10-07 19:21:58 +02:00
parent de7a168377
commit 33681db645
1 changed files with 7 additions and 1 deletions
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8
boxes/vectors.py
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@ -83,7 +83,7 @@ def mmul(m0, m1):
return result return result
def kerf(points, k): def kerf(points, k, closed=True):
"""Outset points by k """Outset points by k
Assumes a closed loop of points Assumes a closed loop of points
""" """
@ -94,6 +94,12 @@ def kerf(points, k):
# get normalized orthogonals of both segments # get normalized orthogonals of both segments
v1 = vorthogonal(normalize(vdiff(points[i - 1], points[i]))) v1 = vorthogonal(normalize(vdiff(points[i - 1], points[i])))
v2 = vorthogonal(normalize(vdiff(points[i], points[(i + 1) % lp]))) v2 = vorthogonal(normalize(vdiff(points[i], points[(i + 1) % lp])))
if not closed:
if i == 0:
v1 = v2
if i == lp-1:
v2 = v1
# direction the point has to move # direction the point has to move
d = normalize(vadd(v1, v2)) d = normalize(vadd(v1, v2))
# cos of the half the angle between the segments # cos of the half the angle between the segments